TY - JOUR
T1 - Superconvergence of DG Method for One-Dimensional Singularly Perturbed Problems
AU - Ziqing Xie & Zhimin Zhang
JO - Journal of Computational Mathematics
VL - 2
SP - 185
EP - 200
PY - 2007
DA - 2007/04
SN - 25
DO - http://doi.org/
UR - https://global-sci.org/intro/article_detail/jcm/8684.html
KW - Discontinuous Galerkin methods, Singular perturbation, Superconvergence,
Shishkin mesh, Numerical traces.
AB - <p style="text-align: justify;">The convergence and superconvergence properties of the discontinuous Galerkin (DG) method for a singularly perturbed model problem in one-dimensional setting are studied. By applying the DG method with appropriately chosen numerical traces, the existence and uniqueness of the DG solution, the optimal order $L_2$ error bounds, and $2p+1$-order superconvergence of the numerical traces are established. The numerical results indicate that the DG method does not produce any oscillation even under the uniform mesh. Numerical experiments demonstrate that, under the uniform mesh, it seems impossible to obtain the uniform superconvergence of the numerical traces. Nevertheless, thanks to the implementation of the so-called Shishkin-type mesh, the uniform $2p+1$-order superconvergence is observed numerically.</p>